In less than 6 months of ownership, my R500 is being towed back to the dealership for the same problems - SRS warning light. According to Mercedes this may cause the airbags to deploy randomly (nice) or not work at all. Also, the low coolant level light is on. For $70k, one would think you would get a much better car. This will definitely be my last Mercedes. Audi Q7, here I come.
Engine performance is terrific for this glorified minivan.
Build a reliable car. Get back to the basics of Mercedes quality. The most recent consumer satisfaction polls speak for themself. Mercedes is not the same Mercedes of old.